package com.sky.aspect;

import com.sky.annotation.AtuoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Slf4j
@Component
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AtuoFill)")
    public void Pt(){}

    @Before("Pt()")
    public void autofill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info( "开始公共字段拦截..." );
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//签名对象
        AtuoFill annotation = signature.getMethod().getAnnotation( AtuoFill.class );//注解对象
        OperationType op = annotation.value();//获得数据库操作类型

        //获取当前被拦截的方法的参数-实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) {
            return;
        }
        Object arg = args[0];

        //准备赋值的参数
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        //根据当前不同的操作类型，未对应的属性通过反射来赋值
        if(op == OperationType.INSERT) {
            //四个参数
            Method setCreateTime = arg.getClass().getMethod( AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class );
            Method setCreateUser = arg.getClass().getMethod( AutoFillConstant.SET_CREATE_USER, Long.class );
            Method setUpdateTime = arg.getClass().getMethod( AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class );
            Method setUpdateUser = arg.getClass().getMethod( AutoFillConstant.SET_UPDATE_USER, Long.class );
            setUpdateUser.invoke( arg,currentId );
            setUpdateTime.invoke(arg,now  );
            setCreateTime.invoke( arg,now );
            setCreateUser.invoke( arg,currentId );

        } else {
            //两个参数1
            Method setUpdateTime = arg.getClass().getMethod( AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class );
            Method setUpdateUser = arg.getClass().getMethod( AutoFillConstant.SET_UPDATE_USER, Long.class );
            setUpdateUser.invoke( arg,currentId );
            setUpdateTime.invoke(arg,now  );
        }
    }
}
